[Elecraft] Receive antennas

Toby Deinhardt dj7mgq at muenchen-mail.de
Sat Feb 2 13:20:07 EST 2008


Hi Drew,

> I'm a bit confused about using a receive-only antenna.  Comments
> suggest that they could be destructive. Is it safe to use one on the
> K2 (the k160rx module) and/or k3?

It all depends on how much power is coming back on the RX antenna.

If you run highish power you need to check for this, because in some 
situations I have seen well over 1W coming back into the radio via the 
RX antenna.

This applies to almost all radios, because most transceivers do not 
disconnect the RX only antenna from the RX front end, when the radio 
transmits.

If you do it properly, it is no problem whatsoever with the K2 and K3, 
i.e. be sure the amount of power on the RX input stays low at all times.

vy 73 de toby
-- 
DD5FZ (ex 4n6fz, dj7mgq, dg5mgq, dd5fz)
K2/10  #885
K2/100 #3248
K3/100 #67
DOK C12, BCC, DL-QRP-AG, JN58td


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